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• W4297200870 endingPage "128921" @default.
• W4297200870 startingPage "128921" @default.
• W4297200870 abstract "High-entropy alloys (HEAs) are currently considered as promising materials for a wide range of applications, including high-temperature use. Since HEAs contain a large number of expensive elements, producing HEA-based coatings seems to be a reasonable approach from an economic point of view. In this study, non-vacuum electron beam cladding was used for the first time to produce CoCrFeNiX layers (where X = Al, Cu or Mn) on a surface of low-carbon steel. As-received coatings had a columnar grain structure with a 〈100〉 fiber texture. The CoCrFeNiCu cladding layer consisted of two fcc phases: Cu-enriched phase was observed in the interdendritic regions, and the Cu-depleted phase was found in dendrites. The CoCrFeNiMn coating had a single-phase fcc structure. CoCrFeNiAl alloy consisted of bcc and B2 phases. The hardness of the Cu and Mn-containing coatings was 190 and 186 HV, respectively. The hardness of the CoCrFeNiAl coating was 570 HV, which is 3.4 times higher compared to the material of the substrate. High-temperature oxidation tests carried out at 850 °C for 45 h revealed that oxide layers formed on the tested samples had a gradient structure that consisted of several different sublayers. The total mass gain due to high temperature oxidation was 2.29 mg/cm 2 , 2.04 mg/cm 2 , and 0.60 mg/cm 2 for the CoCrFeNiCu, CoCrFeNiMn, and CoCrFeNiAl samples, respectively. The mass gain of the base material over the same period of time was 41.01 mg/cm 2 . The CoCrFeNiAl coating had the best oxidation resistance due to the formation of a dense Al 2 O 3 scale. We show that non-vacuum electron beam cladding can be used to produce an HEA-based coating with a different chemical composition. The thickness of coatings in a single pass cladding can be as high as 1.8 mm. CoCrFeNiAl is a suitable coating for low-carbon steel in applications where high hardness and oxidation resistance are required. • HEA-based coatings were fabricated by non-vacuum electron beam cladding. • Coatings were produced from Co + Cr + Ni + X (X = Al, Cu, Mn) powders on Fe-based substrate. • Coatings possessed the columnar grain structure with a <100> fiber texture. • Gradient oxide layers were formed on the coatings during oxidation at 850 °C. • CoCrFeNiAl coating possessed the best oxidation resistance compared to other samples." @default.
• W4297200870 created "2022-09-27" @default.
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• W4297200870 date "2022-10-01" @default.
• W4297200870 modified "2023-10-16" @default.
• W4297200870 title "Structure and oxidation behavior of CoCrFeNiX (where X is Al, Cu, or Mn) coatings obtained by electron beam cladding in air atmosphere" @default.
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• W4297200870 doi "https://doi.org/10.1016/j.surfcoat.2022.128921" @default.
• W4297200870 hasPublicationYear "2022" @default.
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